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Double check PVC if not found in syncVolume. 

If PV is bound by external PV binder (e.g. kube-scheduler), it's
possible on heavy load that corresponding PVC is not synced to
controller local cache yet.
pull/8/head
Yecheng Fu 2018-08-07 15:05:43 +08:00
parent db9545e69e
commit 493502d0ae
1 changed files with 26 additions and 0 deletions
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26
pkg/controller/volume/persistentvolume/pv_controller.go
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@ -123,6 +123,8 @@ const annBindCompleted = "pv.kubernetes.io/bind-completed"
// the binding (PV->PVC or PVC->PV) was installed by the controller. The
// absence of this annotation means the binding was done by the user (i.e.
// pre-bound). Value of this annotation does not matter.
// External PV binders must bind PV the same way as PV controller, otherwise PV
// controller may not handle it correctly.
const annBoundByController = "pv.kubernetes.io/bound-by-controller"
// This annotation is added to a PV that has been dynamically provisioned by
@ -545,6 +547,30 @@ func (ctrl *PersistentVolumeController) syncVolume(volume *v1.PersistentVolume)
if err != nil {
return err
}
if !found && metav1.HasAnnotation(volume.ObjectMeta, annBoundByController) {
// If PV is bound by external PV binder (e.g. kube-scheduler), it's
// possible on heavy load that corresponding PVC is not synced to
// controller local cache yet. So we need to double-check PVC in
// 1) informer cache
// 2) apiserver if not found in informer cache
// to make sure we will not reclaim a PV wrongly.
// Note that only non-released and non-failed volumes will be
// updated to Released state when PVC does not eixst.
if volume.Status.Phase != v1.VolumeReleased && volume.Status.Phase != v1.VolumeFailed {
obj, err = ctrl.claimLister.PersistentVolumeClaims(volume.Spec.ClaimRef.Namespace).Get(volume.Spec.ClaimRef.Name)
if err != nil && !apierrs.IsNotFound(err) {
return err
}
found = !apierrs.IsNotFound(err)
if !found {
obj, err = ctrl.kubeClient.CoreV1().PersistentVolumeClaims(volume.Spec.ClaimRef.Namespace).Get(volume.Spec.ClaimRef.Name, metav1.GetOptions{})
if err != nil && !apierrs.IsNotFound(err) {
return err
}
found = !apierrs.IsNotFound(err)
}
}
}
if !found {
glog.V(4).Infof("synchronizing PersistentVolume[%s]: claim %s not found", volume.Name, claimrefToClaimKey(volume.Spec.ClaimRef))
// Fall through with claim = nil